Flowchart with branches and retries
Default Mermaid packs nodes tightly and lets retries collide with the main path. The beautifier pushes alternates aside and keeps the happy path on the longest line.
Mermaid beautifier
Mermaid Beautifier — turn rough diagrams into presentation-ready output
Paste any Mermaid source — flowchart, sequence, state, class, ER, or Gantt — and the beautifier rewrites the layout for visual clarity: the main path stays calm, retries and branches step aside, and a theme of your choice replaces Mermaid's default look. Free, online, no signup required. Export as SVG or HD PNG when the diagram is ready.
Three Mermaid diagrams, before and after the beautifier
Same Mermaid source on both sides. The After preview is what the beautifier produces with no manual layout — only a one-click theme pick. Open any example in the editor to play with it.
Sequence diagram with three actors
Lifelines feel cramped in default Mermaid. Beautifying widens the actor lanes and gives return arrows room to breathe.
State diagram with retry loops
Retry edges in default Mermaid blur into the main path. The beautifier separates terminal states and routes the retry as a visually distinct return.
Why beautify a Mermaid diagram
Default Mermaid is great for fast drafts but rarely suits a slide, spec, or product page. The beautifier is the finishing step that turns the same source into something you would actually paste into work output.
Source stays untouched
The Mermaid beautifier rewrites the rendered layout, not your syntax. Copy the same source into any other Mermaid tool and it still parses identically.
Six themes for any destination
Atlas and Modern read clean in product docs, Obsidian and Slate stay legible on dark backgrounds, Brutalist and Memphis pop on slide decks. Pick once, export everywhere.
Smarter layout, not just colors
Branches, retries, and merges are routed apart from the main path so the reading order is obvious — most Mermaid diagrams that look noisy are layout problems, not color problems.
SVG and HD PNG export
Crisp SVG with fonts inlined for docs and READMEs. HD PNG sized for slides and tickets. Both keep the beautified layout — no manual redraw.
Frequently asked questions
What does the Mermaid beautifier actually change?
The source stays untouched. The beautifier rewrites the rendered layout — separating retries and branches from the main path, widening cramped node spacing, and applying a theme that matches the destination (docs, deck, README). Your Mermaid syntax is preserved exactly, so the diagram still renders the same logic in any other Mermaid tool.
Is the Mermaid beautifier free?
Yes. Anonymous use covers unlimited preview, beautify, and SVG / PNG export with a small watermark. An account on the free plan removes the watermark and saves diagrams to a personal hub.
Which Mermaid diagram types can be beautified?
Flowchart, sequence, state, class, ER, and Gantt receive bespoke beautification — meaning lane spacing, edge routing, and theme palettes are tuned per type. Mindmap, pie, quadrant, requirement, gitgraph, C4, timeline, and sankey render with the same theme system but use a more general layout pass; their tailored beautification is on the roadmap.
Will my Mermaid theme directives (`%%{init}%%`) be respected?
The init block is preserved in the source, but the visual styling on export follows the Beauty Diagram theme you pick (Atlas, Modern, Brutalist, Memphis, Atelier, etc.). That keeps the exported SVG self-contained and consistent across renderers — your `%%{init}%%` block is still there if you copy the source elsewhere.
Can I export the beautified diagram for slides and docs?
Yes. SVG export inlines fonts and stays crisp at any zoom — best for documentation, READMEs, and modern web destinations. HD PNG export sizes the raster image for slide decks, ticket uploads, and email-friendly attachments where SVG is not supported.
Ready to beautify your Mermaid diagram?
Open the editor, paste your source, click beautify, and export SVG or HD PNG. No signup.